ib.naji (3/3/2013)I seem to remember the reasoning behind this is to allow you to upgrade to other editions (such as Standard) without having to install additional files. (just enter the key for the upgraded edition).

could try this codeplex project as an alternative:

http://standalonesqlagent.codeplex.com/

Or create your own based on Service Broker (which I believe is available in Express edition).